was criticized heavily for being unethical, as well as ethically wrong so
there is a lot of extra reading for you to do in order to put it in
perspective. To start with:

Barth 1974 On Responsibility and Humanity: Calling a Colleague to Account
Current Anthropology 15:99-103
Geddes WR 1975 More Thoughts on the Ik and Anthropology, Current
Anthropology, 16 (3) 348-52 contains a number of comments of other authours
as well